We are living through a transition where artificial intelligence is no longer an optional feature on phones and PCs — it is the operating system’s new nervous system, shaping how we search, write, translate, create, and even control hardware. The four major ecosystems — Apple Intelligence, Google Gemini, Microsoft Copilot, and Samsung Galaxy AI / Vision AI Companion — have each taken distinct technical and product paths. This feature compares them side‑by‑side, verifies key technical claims...